4. Un Client plus élaboré¶

import java.net.*;
import java.io.*;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Scanner;

public class Client { /* define the client class */

	private final String hote;
	private final int port;
	private final String id;
	private Scanner console_input;
	final String Finish = "" + (char) 4;  //Signal de fin de connection aussi nommé EOT  ctrl-d
	byte[] datas=null;
	private String fileName; 
	
	public Client(String hote, int port, String mon_id) {
		this.hote = hote;
		this.port = port;
		this.id = mon_id;
	}

	private void getdata() {
		Boolean wait_for_file = true;
		console_input = new Scanner(System.in);
		while (wait_for_file) {
			System.out.println("Entrez le nom du ficher à envoyer");
			fileName = console_input.next();
			System.out.println("Opening " + fileName);
			try {
				Path file_path = Paths.get(fileName);
				datas = Files.readAllBytes(file_path);
				System.out.println(datas.length + " Bytes Read ");
				return;
			} catch (java.nio.file.InvalidPathException e) {
				System.out.println("path is incorrect");
			} catch (java.nio.file.NoSuchFileException e) {
				System.out.format("Absence du fichier %s\n",  fileName);
				continue;
			} catch (IOException e) {
				System.out.println("Cannot read data, is the file there ? : "
						+ e);
				continue;
			}
		}
	}

	public void execute() {
		Socket la_connection = null;
		OutputStream os;
		PrintWriter  ma_sortie; 
		try {
			la_connection = new Socket(this.hote, this.port);
	} catch (IOException e) {
		System.out.format("Probleme de connection avec le serveur %s\n",e);
		System.exit(-1);}
		try {
			os= la_connection.getOutputStream();
			ma_sortie = new PrintWriter(os, true);
			System.out.println(" Contacting " + this.hote + " on " + this.port);
			ma_sortie.println("Hello je suis :" + this.id);
						
			getdata();
			os.write(datas, 0, datas.length);
			System.out.println("Données envoyées, envoi de la terminaison");
			ma_sortie.println(Finish);
		} 
		catch (IOException e) {
			System.out.println("data not fully transmited : " + e);}
	}
 
	public static void main(String[] args) {
		if (args.length != 3) {
			System.err.println("Il me faut 3 arguments:  hote  port identifiant");
			System.exit(1);}

		try {
			new Client(args[0], Integer.parseInt(args[1]), args[2]).execute();} 
		catch (NumberFormatException e) {
			System.out.format("Mauvais format du port\n %s\n",  e.getMessage());
			System.exit(-1);
		}
	}

}